As stiff as BB ply is, the original in pristine shape is cheap crate making grade at best if made after the mid-60s, hence the 1/2" and personally would use 3/4" since these cabs need a lot of bracing and mass as partly proven by Jeff Medwin/'low ohms':
Adding MASS to an A-7 825 enclosure
Mass Loading ALTEC A7 VOTT 825 enclosures - drlowmu - High Efficiency Speaker Asylum
High Efficiency Speaker Asylum
Another adding mass related thread:
Mass Loading A7s, VERY inexpensive, reversible, needed -
Re leaving stock, this is fine for prosound, but in a typical HIFI/HT app where the listening distance is only fractionally as long plus in a resonant, acoustically small room?
Not my idea of 'HIFI', but to each their own.
Well, you can extend the sides, back to make a separate horn cab on top or you can tune the vent with a little extra effort by adding a full width baffle in lieu of the stock 'L' bkt. with a shelf to close the bottom off, tuning the gaps on either side of the horn with tubes, then doing a bit of reflections damping that does double duty covering them up if no grills.
GM
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